June 2015 - which supermarket was cheapest?Which? compares prices of a basket of groceries

10 July 2015

Shopping trolley

Asda was cheapest for our comparison basket in June

Each month, we compare the price of a basket of products across the main supermarkets. For June 2015, Asda was cheapest for Which?'s supermarket price comparison basket - by £10.19.

We compare the prices of between 70 and 100 big brand grocery products across the main online supermarkets. Asda continues its run of winning form - it was cheapest last month, too. 

Asda charged £133.07 for the 73 products. Compared with Ocado, the most expensive, which charged £143.26.

To find out how the other supermarkets stacked up this month and over the past year, check out supermarket prices compared.

The supermarkets in June

Waitrose announced that it will give its customers the power to pick which groceries they save money on, in a scheme called 'Pick Your Own Offers'.

Members of myWaitrose can choose which products they’d like to save 20 per cent on, from a list of nearly a thousand.

See how Waitrose fares against its rival supermarkets - our supermarket survey reveals the best and worst supermarkets.

Supermarket price comparison schemes

Most supermarkets have a price matching scheme. This means they compare their prices against other supermarkets, often giving you a voucher for the difference if it would have been cheaper elsewhere. However, these schemes do vary - for instance:

  • Asda checks against Tesco, Sainsbury's, Waitrose or Morrisons. It will give you a voucher for the difference if it isn't 10% cheaper
  • Morrisons compares against Aldi, Lidl, Tesco, Sainsbury’s and Asda, and gives you the difference in points
  • Tesco checks your prices against Asda, Sainsbury’s and Morrisons. It will give you a voucher for the difference if it's cheaper elsewhere
  • Sainsbury's has a price match for branded items only and compares against Asda
  • Waitrose price matches Tesco on branded items and these are the prices it sells for.

Which?'s price comparison basket

To establish the price of our baskets, we compared prices at the main online supermarkets Asda, Morrisons, Ocado, Sainsbury's, Tesco and Waitrose. We used data from the independent shopping website Mysupermarket.

The prices were averaged over the month and include discounts but not multibuys. 

Every month, we look at the prices of between 70 and 100 products - these are all branded items. They include a range of everyday items, from bread to toilet paper.

More on this...

  • Are loyalty cards worth it? Find out on our loyalty cards page
  • See what Waitrose's customers think of it - click Waitrose
  • Best food and drink: see our gallery of taste test winners